Only a single textbook on skin diseases mentions the appearance of mucous membrane lesions in cases of pityriasis rosea. Andrews' textbook1 mentions that Hazen and Wile have observed such lesions. In 1938 Guequierre2 presented a case before the Philadelphia Dermatological Society in which there was typical pityriasis rosea with lesions in the mouth. The connection between the pityriasis rosea and the oral lesions was questioned at that time. Guequierre and Wright3 published a summary of 14 cases of pityriasis rosea with oral lesions in 1941; punctate hemorrhagic lesions were observed in their third case. S. S. Greenbaum4 reported four cases similar to this third case shortly thereafter. M. J. Costello5 presented another similar case before the Metropolitan Dermatological Society in 1946; the participants in the discussion emphasized that this was the first case of pityriasis rosea in which they had seen lesions of the mucous
ROSENBAUM MG. ORAL LESIONS IN PITYRIASIS ROSEA. AMA Arch Derm Syphilol. 1951;63(3):376–377. doi:10.1001/archderm.1951.01570030090011
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